Anger as Democrats play religious card in election
The man at the centre of the storm is Bobby Jindal, a Catholic and the Republican candidate in the race to be state governor.
Democrats say the 30-second ad - running in heavily Protestant areas - simply explains Mr Jindal's beliefs with his own words. But Mr Jindal says his views have been distorted, and a letter has been sent to nine TV stations saying the advert is defamatory and asking them to stop showing it. Fellow Republicans say it is a smear campaign.
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Hide AdThe advert features an actress saying Mr Jindal does not respect other people's religions and directs viewers to a website with links to several articles Mr Jindal wrote on Catholicism.
In one, Mr Jindal talks of the Catholic religion as the true Christian faith and refers to a "scandalous series of divisions and new denominations" of religions since the Protestant Reformation of the 16th century.
But he also wrote that the Catholic Church must incorporate the "spirit-led movements" of other Christian faiths.